回複：是前輪，後輪好像不那麽熱，裝好的時候好像不是很難轉動。

sorry, you are not good to do this job.
you are better gotten training first
doing the brake job, you have to lubricate sliding pis,
calipers, pads(the parts contact with brake anchor)
do not oily the pads friction side(contact with rotor)
you must make sure caliper not seized
you must make sure brake hose not plugged
(when you release brake pedal, brake pads must move back)